Caelum Incognitum — The interactive encyclopedia of ufology
Acronyms to know
Classifications & scales
UFO / OVNI: unidentified flying object. UAP: unidentified anomalous phenomena. PAN: unidentified aerospace phenomenon. FANI: unidentified aerial phenomenon (Spanish). USO / OSNI: unidentified submerged object. IFO: identified flying object. CE1-CE5: close encounters. NL, DD, RV: nocturnal lights, daylight discs, radar-visual. MIB: men in black. ETH / HET: extraterrestrial hypothesis. NHI: non-human intelligence. SETI: search for extraterrestrial intelligence.
See also
- UFO (unidentified flying object)
- UAP (unidentified anomalous phenomena)
- PAN (unidentified aerospace phenomenon)
- FANI (Spanish-language unidentified aerial phenomenon)
- USO (unidentified submerged object)
- IFO (identified flying object)
- Close encounter of the first kind (CE1)
- Nocturnal lights (NL)
- Men in Black (MIB)
- Extraterrestrial hypothesis (ETH)
- NHI (non-human intelligence)
- SETI